Swimming appliance.



R. W. DAVIS.

SWIMMING APPLIANCE.

APPLICATION FILED MAY 2. I917.

1,239,088. Patented Sept. 4,1917.

2 SHEETS-SHEET I MTNESSES. IN VEN 7'01? H. W. DAVIS. SWlMNllNG APPLIANCE. APPLICATUJN HLED MAY 2. m1.

1,239,088. PatentedSept. 4, 1917.

2 SHEETS-SHEET 2.

WITNESSES INVENTOR.

.QWJ w/mmszm.

ROBERT WILLIAM DAVIS, 01! EAST OBLING'E, NEW JERSEY.

BG APPLIANCE.

Specification of Letters Patent.

Patented Sept. 4, 191 '7.

Application fled m 2, 1917. Serial 1V0. 166,924.

To all whom it may concern:

, Be it known that I, ROBERT WILLIAM DAVIS, a citizen of the United States, residing at 447 Norwood street, East Orange, in the county of Essex and State of New Jersoy, have invented a new and useful Swimmmg Appliance, of which the following is a specification.

My invention relates to improvements in swimming appliances for ropulsion and partial support; and the ob ects of my improvements are: first, to provide for a swimmer a means for exerting an uniform force against the water for propulsion and support; second, to provide for a swimmer an appliance for propelling or supporting himself without the waste of ener found in swimming with no appliance; third, to provide a swimming app iance whose parts are detachable for portability; and fourth, to provides simple swimming appliance consisting of a screw propeller, whose thrust is exerted on a stirru for the swimmers foot, and which is turn by his hands.

I attain these objects by the device illustrated in the accompanying drawings, in which- Fi ure 1 is a front elevation of the entire appliance; and Fig. 2 is a plan view of same.

imilar numbers refer to similar parts throughout the several views.

The screw propeller 1 consists of a hollow cylinder, on the outside of which two or more blades are mounted. The blades are yed backward (in direction of axis) and orward (in direction of rotation) by the guy wires 2. The hollow cylindrical hub, with comparatively thin wall, rotates and moves ahead without moving much water, and therefore without wasting much ener The guy wires 2 strengthen the in t c direction of resultant force, which is also the direction of least strength of the blades themselves.

The double crank 3 is a round metal rod with two right angle bends in it. Near one end it is countersunk on opposite sides for the cone point headless set screws 4, whichscrew in lugs on propeller 1, and hold crank 8 firmly therein. The other end of the crank 8 is riveted over the end of the outer handle 5. The inner handle 5 is secured between the ropeller and one of the bends in the crank.- lhe handles 5 are free to turn on the rod of the crank 8.

The thrust of the propeller 1 is exerted on the foot of the swimmer by means of the three wires 6 connecting the hub of the propeller 1 with the three-pron header 7, which, with collar 8 and eye piece 9, forms a turning joint, which is connected to stirrup 14 by means of straps 10 and 12, eye piece 13, and buckle 11, which adjusts the length of the whole thrust rigging.

Since my previous application, Serial No. 164672, covers the simpler form of this swimming appliance, I shall not repeat those claims, but I now claim 1. In a swimming appliance, a screw ropeller having a comparatively large ho low cylindrical hub on whose outside two or more blades are mounted, and to which a crank is fastened for turning same.

2. In a swimming appliance the combination of a screw propeller, a double crank suitable to turn said propeller with both hands, and an axial-tension or thrust rigging provided with means for adjusting its length and suitable to apply the axial-tension of said propeller on swimmers foot.

3. In a swimming appliance the combination of a. screw propeller having an annular hub, a 180 double hand crank detachably secured thereto, and an axial-tension or thrust rigging provided with a turning joint, a means for adjusting its length, and a stirrup suitable to apply the axial-tension of said propeller to swimmers foot.

4. n a swimming :1. pliance the combination of a screw propel or having a, com rativel large annu ar cylindrical hu on whic the blades are mounted and to which they are guyed forwardly in direction of rotation and backwardly in direction of axis, a 180 double hand crank (made of round metal rod with two right-angle bends in o posite directions in it) detachably and rmly secured to said propeller and carrying two loose handles, and an axial-tension or thrust rigging connected to said annular hub by means of three wires 120 apart and provided with a turnin joint, a means for adjusting its length, an a stirrup suitable to apply the axial-tension of said propeller to the swimmers foot.

5 In a swimming ap liance, a screw ropeller consisting of a ho low cylindrical ub, and blades on the outside of said hub. a boss also on the outside of the hub, and a turning crank fastened to said boss.

6. In a swimming ap liance, a screw ropeller consisting of a ho low cylindrical ub, and blades on the outside of said hub, a crank fastened to the hub for turning the 5 propeller by hand, and a thrust rigging swiveled to the propeller and having means for attachment to a swimmers foot.

7. In a swimming appliance, a screw ropeller eonsistin of a hollow e lindrical ab 1 and blades on t e outside of t e hub, and a turning crank fastened to the hub and having a portion arranged diametrically of the hub, there being handles at both ends of said portion.

8. In a swimming appliance, a screw ropeller consisting of a hollow cylindrical ab and blades on the outside of said hub, a turning crank fastened to the hub and having a portion arranged diametrically of the same, and loose handles at the opposite ends of said diametrically arranged portion.

All that is claimed is substantially as specified and for the ur ose set forth.

ROBERT LEIAM DAVIS. 

